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Preparation, characterization and photocatalytic performance of titania particles encapsulated in hollow silica shells as an efficient photocatalyst for redox-combined stereoselective synthesis of l-pipecolinic acid from l-lysine

Paper ID Volume ID Publish Year Pages File Format Full-Text
26873 43983 2012 10 PDF Available
Title
Preparation, characterization and photocatalytic performance of titania particles encapsulated in hollow silica shells as an efficient photocatalyst for redox-combined stereoselective synthesis of l-pipecolinic acid from l-lysine
Abstract

Hollow core–shell particles of a titania core and a silica shell, the latter of which was highly porous, water-swollen and not directly connected to the former, were synthesized by a multistep process including carbon and silica coatings followed by calcination of the carbon-layer combustion. The core–shell particles suspended in aqueous solutions of l-lysine showed improved stereoselectivity in photocatalytic redox-combined synthesis of l-pipecolinic acid (l-PCA), maintaining l-lysine conversion and PCA selectivity, compared with that by bare titania particles, presumably due to the acidic microenvironment of the titania core to control the position of oxidation by positive holes as the first step of the redox-combined process. Modification of the silica layers to acidify them was also beneficial for improvement of optical purity of the product, PCA.

Graphical abstractPlatinized titania particles encapsulated in hollow silica shells were prepared as an efficient photocatalyst for redox-combined stereoselective synthesis of l-pipecolinic acid from l-lysine.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Hollow (titania) core–(silica) shell particles were prepared successfully. ► They showed good performance in photocatalytic l-pipecolinic acid synthesis. ► Optical purity of l-pipecolinic acid was highly improved compared with bare titania. ► Microenvironment induced by swollen silica shell was beneficial.

Keywords
Hollow core–shell particle; Titania core; Silica shell; Photocatalytic synthesis of l-pipecolinic acid; Stereoselectivity
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Preparation, characterization and photocatalytic performance of titania particles encapsulated in hollow silica shells as an efficient photocatalyst for redox-combined stereoselective synthesis of l-pipecolinic acid from l-lysine
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 246, 15 October 2012, Pages 50–59
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us